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本文从力学性能、化学稳定性和断口形貌诸方面确切地描述了两种双相不锈钢在450℃～500℃温区内长时间保温后所呈现出的脆性的表象规律,认为具有典型的475℃脆性的特征。并通过微观机制的研究,进一步确认该脆性主要是由于在铁素体母体上均匀弥散析出的体心富铬α＇相所致。
In this paper, the appearance of brittleness of two kinds of duplex stainless steels after 450 ℃ ~ 500 ℃ for a long time is accurately described from mechanical properties, chemical stability and fracture morphology. It is considered that the typical 475 ℃ brittle characteristics. And through the micro-mechanism of the study, further confirmed that the brittleness is mainly due to the uniform dispersion of ferrite matrix body-rich chromium α ’phase due.